You can learn from books about many things or even from the internet. But experience is much more important than knowledge.
I read many books to learn basic knowledge. I work so hard to memorize the basic theories. However, I often forget them when I encounter some common issues. I know what I should do but I can't because I can't apply it to practice.
Someties you only get limited information about limited issues from the book. There should be many topics or issues but you can't access to them because you even don't know these issues exist! And books don't tell you your weak points but experience or other people surpervise you and recognise what you need and what you don't have.